This is a used Orion Sirius Plossl telescope eyepiece. It has a diameter of 1.25 inches and a focal length of 10mm. This 10mm eypeiece is a great moderately high power eyepiece for observing small planetary nebulas and globular star clusters, as well as viewing planets when seeing conditions don't permit higher magnificationn. To determine exactly how much magnification this eyepiece will give you, divide the focal length of the telescope by the focal length of the eyepiece. So a telescope with a 900mm focal length, this would give a magnification of 90x. The eyecup is reversible for easier storage.
Please also see my other listings for a 25mm eyepiece and a 2x Barlow lens that will double the magnification of the eyepiece. If you want to purchase multiple items I will refund the 2nd/3rd shipping charge by PayPal after you have paid.
US buyers only with PayPal only, please. Eyepiece will be shipped by USPS Priority Mail.
Filed under: Eyepieces & Accessories